Waste Management is selling a subsidiary to Energy Capital Partners for $1.94 billion as part of its effort to focus on its core business.

It is selling Wheelabrator Technologies Inc., which owns or runs 17 waste-to-energy facilities and four independent power-producing plants in the U.S. The business also has four ash monofill landfills, three transfer stations and an ongoing development and construction project in the U.K. Wheelabrator's 2013 revenue totaled about $845 million.

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Houston-based Waste Management Inc. said Tuesday it plans to use proceeds from the sale to buy assets related to its core business and for stock repurchases.

The deal is targeted to close later this year. It still needs approval from the Federal Energy Regulatory Commission.